Revert: crypto: DRBG - switch to HMAC SHA512 DRBG as default DRBG

JIRA: INTERNAL
Revert Author <[email protected]>
Revert Commit 9b7b946
Revert Reason: This changes the default DRBG back to HMAC SHA256 as more
processors have hardware acceleration for this algorithm.
Approved by the lab.

	The default DRBG is the one that has the highest priority. The priority
	is defined based on the order of the list drbg_cores[] where the highest
	priority is given to the last entry by drbg_fill_array.

	With this patch the default DRBG is switched from HMAC SHA256 to HMAC
	SHA512 to support compliance with SP800-90B and SP800-90C (current
	draft).

	The user of the crypto API is completely unaffected by the change.

	Signed-off-by: Stephan Mueller <[email protected]>
	Acked-by: simo Sorce <[email protected]>
	Signed-off-by: Herbert Xu <[email protected]>

Signed-off-by: Jeremy Allison <[email protected]>
Signed-off-by: Jonathan Maple <[email protected]>

Author: jallisonciq

crypto/drbg.c

@@ -176,18 +176,18 @@ static const struct drbg_core drbg_cores[] = {
 		.blocklen_bytes = 48,
 		.cra_name = "hmac_sha384",
 		.backend_cra_name = "hmac(sha384)",
-	}, {
-		.flags = DRBG_HMAC | DRBG_STRENGTH256,
-		.statelen = 32, /* block length of cipher */
-		.blocklen_bytes = 32,
-		.cra_name = "hmac_sha256",
-		.backend_cra_name = "hmac(sha256)",
 	}, {
 		.flags = DRBG_HMAC | DRBG_STRENGTH256,
 		.statelen = 64, /* block length of cipher */
 		.blocklen_bytes = 64,
 		.cra_name = "hmac_sha512",
 		.backend_cra_name = "hmac(sha512)",
+	}, {
+		.flags = DRBG_HMAC | DRBG_STRENGTH256,
+		.statelen = 32, /* block length of cipher */
+		.blocklen_bytes = 32,
+		.cra_name = "hmac_sha256",
+		.backend_cra_name = "hmac(sha256)",
 	},
 #endif /* CONFIG_CRYPTO_DRBG_HMAC */
 };